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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_file_stat_h) |
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25 #define octave_file_stat_h 1 |
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26 |
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27 #include <string> |
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28 |
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29 #include "oct-time.h" |
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30 |
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31 #ifdef HAVE_SYS_TYPES_H |
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32 #include <sys/types.h> |
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33 #endif |
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34 |
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35 class |
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36 file_stat |
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37 { |
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38 public: |
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39 |
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40 file_stat (const std::string& n = std::string (), bool fl = true) |
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41 : file_name (n), follow_links (fl), initialized (false) |
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42 { |
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43 if (! file_name.empty ()) |
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44 update_internal (); |
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45 } |
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46 |
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47 file_stat (const file_stat& f) { copy (f); } |
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48 |
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49 file_stat& operator = (const file_stat& f) |
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50 { |
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51 if (this != &f) |
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52 copy (f); |
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53 |
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54 return *this; |
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55 } |
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56 |
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57 ~file_stat (void) { } |
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58 |
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59 void get_stats (bool force = false) |
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60 { |
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61 if (! initialized || force) |
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62 update_internal (force); |
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63 } |
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64 |
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65 void get_stats (const std::string& n, bool force = false) |
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66 { |
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67 if (n != file_name || ! initialized || force) |
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68 { |
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69 initialized = false; |
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70 |
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71 file_name = n; |
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72 |
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73 update_internal (force); |
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74 } |
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75 } |
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76 |
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77 // File status and info. These should only be called for objects |
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78 // that are already properly initialized. |
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79 |
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80 bool is_blk (void) const; |
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81 bool is_chr (void) const; |
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82 bool is_dir (void) const; |
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83 bool is_fifo (void) const; |
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84 bool is_lnk (void) const; |
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85 bool is_reg (void) const; |
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86 bool is_sock (void) const; |
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87 |
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88 ino_t ino (void) const { return fs_ino; } |
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89 dev_t dev (void) const { return fs_dev; } |
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90 |
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91 nlink_t nlink (void) const { return fs_nlink; } |
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92 |
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93 uid_t uid (void) const { return fs_uid; } |
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94 gid_t gid (void) const { return fs_gid; } |
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95 |
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96 off_t size (void) const { return fs_size; } |
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97 |
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98 octave_time atime (void) const { return fs_atime; } |
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99 octave_time mtime (void) const { return fs_mtime; } |
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100 octave_time ctime (void) const { return fs_ctime; } |
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101 |
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102 #if defined (HAVE_STRUCT_STAT_ST_RDEV) |
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103 dev_t rdev (void) const { return fs_rdev; } |
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104 #endif |
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105 |
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106 #if defined (HAVE_STRUCT_STAT_ST_BLKSIZE) |
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107 long blksize (void) const { return fs_blksize; } |
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108 #endif |
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109 |
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110 #if defined (HAVE_STRUCT_STAT_ST_BLOCKS) |
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111 long blocks (void) const { return fs_blocks; } |
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112 #endif |
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113 |
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114 std::string mode_as_string (void) const; |
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115 |
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116 bool ok (void) const { return initialized && ! fail; } |
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117 |
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118 operator bool () const { return ok (); } |
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119 |
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120 bool exists (void) const { return ok (); } |
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121 |
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122 std::string error (void) const { return ok () ? std::string () : errmsg; } |
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123 |
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124 // Has the file referenced by this object been modified since TIME? |
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125 bool is_newer (const octave_time& time) const { return fs_mtime > time; } |
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126 |
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127 // It's nice to be able to hide the file_stat object if we don't |
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128 // really care about it. |
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129 static int is_newer (const std::string&, const octave_time&); |
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130 |
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131 private: |
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132 |
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133 // Name of the file. |
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134 std::string file_name; |
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135 |
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136 // TRUE means follow symbolic links to the ultimate file (stat). |
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137 // FALSE means get information about the link itself (lstat). |
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138 bool follow_links; |
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139 |
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140 // TRUE means we have already called stat. |
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141 bool initialized; |
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142 |
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143 // TRUE means the stat for this file failed. |
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144 bool fail; |
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145 |
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146 // If a failure occurs, this contains the system error text. |
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147 std::string errmsg; |
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148 |
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149 // file type and permissions |
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150 mode_t fs_mode; |
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151 |
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152 // serial number |
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153 ino_t fs_ino; |
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154 |
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155 // device number |
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156 dev_t fs_dev; |
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157 |
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158 // number of links |
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159 nlink_t fs_nlink; |
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160 |
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161 // user ID of owner |
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162 uid_t fs_uid; |
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163 |
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164 // group ID of owner |
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165 gid_t fs_gid; |
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166 |
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167 // size in bytes, for regular files |
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168 off_t fs_size; |
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169 |
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170 // time of last access |
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171 octave_time fs_atime; |
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172 |
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173 // time of last modification |
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174 octave_time fs_mtime; |
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175 |
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176 // time of last file status change |
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177 octave_time fs_ctime; |
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178 |
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179 #if defined (HAVE_STRUCT_STAT_ST_RDEV) |
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180 // device number for special files |
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181 dev_t fs_rdev; |
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182 #endif |
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183 |
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184 #if defined (HAVE_STRUCT_STAT_ST_BLKSIZE) |
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185 // best I/O block size |
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186 long fs_blksize; |
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187 #endif |
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188 |
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189 #if defined (HAVE_STRUCT_STAT_ST_BLOCKS) |
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190 // number of 512-byte blocks allocated |
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191 long fs_blocks; |
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192 #endif |
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193 |
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194 void update_internal (bool force = false); |
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195 |
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196 void copy (const file_stat&); |
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197 }; |
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198 |
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199 #endif |
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200 |
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201 /* |
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202 ;;; Local Variables: *** |
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203 ;;; mode: C++ *** |
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204 ;;; End: *** |
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205 */ |
